1 /*
2 * Copyright 2020 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 #include <iostream>
17
18 #include "android-base/file.h"
19 #include "fuzzer/FuzzedDataProvider.h"
20 #include "utils/FileMap.h"
21
22 static constexpr uint16_t MAX_STR_SIZE = 256;
23 static constexpr uint8_t MAX_FILENAME_SIZE = 32;
24
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)25 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
26 FuzzedDataProvider dataProvider(data, size);
27 TemporaryFile tf;
28 // Generate file contents
29 std::string contents = dataProvider.ConsumeRandomLengthString(MAX_STR_SIZE);
30 // If we have string contents, dump them into the file.
31 // Otherwise, just leave it as an empty file.
32 if (contents.length() > 0) {
33 const char* bytes = contents.c_str();
34 android::base::WriteStringToFd(bytes, tf.fd);
35 }
36 android::FileMap m;
37 // Generate create() params
38 std::string orig_name = dataProvider.ConsumeRandomLengthString(MAX_FILENAME_SIZE);
39 size_t length = dataProvider.ConsumeIntegralInRange<size_t>(1, SIZE_MAX);
40 off64_t offset = dataProvider.ConsumeIntegralInRange<off64_t>(1, INT64_MAX);
41 bool read_only = dataProvider.ConsumeBool();
42 m.create(orig_name.c_str(), tf.fd, offset, length, read_only);
43 m.getDataOffset();
44 m.getFileName();
45 m.getDataLength();
46 m.getDataPtr();
47 int enum_index = dataProvider.ConsumeIntegral<int>();
48 m.advise(static_cast<android::FileMap::MapAdvice>(enum_index));
49 return 0;
50 }
51